Last Man on Earth can't figure out what happens after the world ends

Last Man on Earth is its own worst enemy. Its narrative begins at an end (the end of the world), and it doesn't seem to know where to go from there, because it's already killed off all the extras and most of the supporting cast. The entire premise of Last Man on Earth necessitates stagnancy, boredom, and a heavily pruned population, and it has had a hard time finding nuance. The jokes are either hackneyed (farts) or reliant on very specific character traits that are funny at first, but lose steam quickly (Kristen Schaal's Carol is a weirdo, Will Forte's Phil is a hapless loaf who thinks he deserves more than this, okay?). The plot itself has circled down a drain of doubt and hesitation since its first episode: anything goes, nothing...